Mongodb – Authenticate MongoDB shard cluster in Docker swarm

dockermongodbmongodb-3.4

I am trying to put authentication to the mongo shard cluster which is running in docker swarm.

docker-compose.yml file:

version: "3.3"
services:
    cfg1-r1:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == ram-ThinkPad-E470]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/db-data:/var/lib/mongodb
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--configsvr", "--replSet", "rs0", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--configsvr", "--replSet", "rs0", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    cfg2-r1:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == prasanna-ThinkPad-E470]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/db-data:/var/lib/mongodb
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--configsvr", "--replSet", "rs0", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--configsvr", "--replSet", "rs0", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    shard1-repl1:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == prasanna-ThinkPad-E470]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/db-shard:/var/lib/mongodb
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--shardsvr", "--replSet", "s1-r1", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--shardsvr", "--replSet", "s1-r1", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    shard2-repl1:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == Trisundhar]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/db-shard:/var/lib/mongodb
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--shardsvr", "--replSet", "s1-r1", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--shardsvr", "--replSet", "s1-r1", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    shard1-repl2:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == Ravi-ThinkPad-E470]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/db-shard:/var/lib/mongodb
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--shardsvr", "--replSet", "s2-r2", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--shardsvr", "--replSet", "s2-r2", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    shard2-repl2:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == Dsp-Lenovo]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/db-shard:/var/lib/mongodb
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--shardsvr", "--replSet", "s2-r2", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--shardsvr", "--replSet", "s2-r2", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    shard1-repl3:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == Alu]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/db-shard:/var/lib/mongodb
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--shardsvr", "--replSet", "s3-r3", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--shardsvr", "--replSet", "s3-r3", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    shard2-repl3:
        image: mongo:3.4.9
        deploy:
            placement:
                constraints: [node.hostname == Acer-Idavalapati]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/mongod.conf:/etc/mongod.conf
            - /opt/mongosharddb/db-shard:/var/lib/mongodb
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        command: ["mongod", "--shardsvr", "--replSet", "s3-r3", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
        #command: ["mongod", "--shardsvr", "--replSet", "s3-r3", "--dbpath", "/var/lib/mongodb", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

    mongos:
        image: mongo:3.4.9
        deploy:
            replicas: 2
            placement:
                constraints: [node.hostname == ram-ThinkPad-E470]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongosharddb/mongodb-keyfile:/srv/mongodb-keyfile
        networks:
            - mongoshard
        ports:
            - 27030:27017
        depends_on:
            - cfg1-r1
            - cfg2-r1
            - cfg3-r1
            - shard1-repl1
            - shard2-repl1
            - shard1-repl2
            - shard2-repl2
            - shard1-repl3
            - shard2-repl3
        command: ["mongos", "--configdb", "rs0/cfg1-r1:27017", "--port", "27017"]
        #command: ["mongos", "--configdb", "rs0/cfg1-r1:27017", "--port", "27017", "--keyFile", "/srv/mongodb-keyfile"]

networks:
    mongoshard:
        driver: overlay
        attachable: true

Deploy: sudo docker stack deploy –with-registry-auth –compose-file docker-compose.yml mongo

I initiated replica set of config server and shard servers. I added shards to mongos. When I put data in the database, sharing is happening among shard servers.

I have done this without authentication. Everything is going well.

But when I try to add authentication I am failing to do.

Steps followed to enable authentication on MongoDB cluster in docker swarm:

Step1: Created required data folders and generated key file and copied this key file to each node.

Step2: Deployed stack file in docker swarm without the key file.

Step3: Initiated config server and shard servers replica set.

Step4: Added users to the mongos, config servers and shard servers.

Step5: Changed the ownership of key file and mongod.conf file in each container.

Ex:sudo docker exec bash -c 'chown -R mongodb:mongodb /srv/mongodb-keyfile /etc/mongod.conf'

Step6: Deployed docker-compose.yml (updated) again in docker swarm with the second command (With key fie). [It runs all containers with key file]

Step7: When I try to add shards to the mongos, I am getting error

mongos> sh.addShard("s3-r3/shard1-repl3:27017")
{
        "code" : 133,
        "ok" : 0,
        "errmsg" : "could not find host matching read preference { mode: \"primary\" } for set s3-r3"
}

I have setup authentication on nodes(without docker). It's working there properly.

Edit: If I add shards to mongos before authentication then sharding is not happening. All the data is going to only one shard (Eg: s3-r3).

logs of other shards (services): 

mongo_shard1-repl1.1.fgq9hukdsvmf@prasanna-ThinkPad-E470    | 2017-10-20T07:15:09.338+0000 W NETWORK  [ReplicaSetMonitor-TaskExecutor-0] No primary detected for set s1-r1
mongo_shard1-repl1.1.fgq9hukdsvmf@prasanna-ThinkPad-E470    | 2017-10-20T07:15:19.338+0000 W NETWORK  [ReplicaSetMonitor-TaskExecutor-0] Failed to connect to 10.0.6.37:27017 after 5000ms milliseconds, giving up.

Best Answer

As per MongoDB BOL Here Use the sh.addShard() method to add each shard to the cluster. If the shard is a replica set, specify the name of the replica set and specify a member of the set. In production deployments, all shards should be replica sets.

The following operation adds a single shard replica set to the cluster:

sh.addShard( "<replSetName>/s1-mongo1.example.net:27017")

The following operation is an example of adding a standalone mongod shard to the cluster:

sh.addShard( "s1-mongo1.example.net:27017")

Repeat these steps until the cluster includes all shards.

Enable Sharding for a Database

To proceed, you must be connected to a mongos associated to the target sharded cluster.

Before you can shard a collection, you must enable sharding for the collection’s database. Enabling sharding for a database does not redistribute data but make it possible to shard the collections in that database.

Once you enable sharding for a database, MongoDB assigns a primary shard for that database where MongoDB stores all data in that database.

Use the sh.enableSharding() method to enable sharding on the target database.

sh.enableSharding("<database>")

For further your ref Here, Here & Here

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